Tom,
Yes, cut those traces if it has not already been done.\
That may or may not solve your problem.
73,
Don W3FPR
On 2/27/2018 9:40 AM, Thomas Doligalski wrote:
Larry W0LRF wrote earlier this month:
There have been a few posts on this subject, but none had answers.
Both my main and sub receiver are on the same antenna.
The audio volume from the sub is much lower.
The AF for the main is…… let’s say at 9 o’clock….. to get equal volume level
from the sum… Sub AF has to be at 3-4 o’clock.
RF on both are the same.
Any suggestions? Is this normal?
I have the same problem with K3 #969.
All was fine when I first installed the KRX3, right after it was released.
However, when I installed the new K3SYNA boards the audio problem for the sub
receiver manifested itself.
I have verified that the settings and filters for the sub receiver are the same
as the main receiver. Note that the RF signal between the two receivers is
identical, as shown on the K3 S-meter and the P3 display.
Recently I noted the latest KRX3 installation manual (downloaded from electraft.com)
has a section entitled "Checking and Modifying Resistor R91 and DAC Input
Circuits”. The manual I followed when installing my KRX3 only had a similar section
entitled “Checking and Modifying Resister R91”.
The latest KRX3 installation manual states that the missing step involves
cutting two traces on the main board board to the left of R91, with the
justification that “This modification ensures the digital-to-analog converters
(DACs) always receive the proper signal levels. It has been incorporated into
all later K3s.”
Could this be the cause of my Low sub receiver volume problems? Should I cut
these traces now?
Thanks and 73!
Tom W4KX
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